Spindle mounting



Nov. 26, 1929.

P. H. HUTCHINSON SPINDLE MOUNTING Filed March 14; 1924 i0 Fig.1

Patented Nov. 26 1929 U Nl TE-DSTATES PATENT orrlca PHILIP H. HUTOHINSON, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO GENERAL MOTORS CORPORATION, OF DETROITyMIQHIGAN, A CORPORATION OF DELAWARE.

srmnnn moun'rme Application filed March 14, 1924. serial No. 699,870.

This invention relates to spindle mountings and is herein shown as embodied in a ball.

\ bearingmounting and driving means for the spindle of an internal grinding machine.

Grinding spindles for" accurately finishing the interior of race rings and other'hollow articles must run true, without chattering or vibration, aHdthe' pressure of the grinding wheel against the work and the pull of the belt drive must cause no distortion. A spindle with plain hearings will not run true, due

. to the necessity for some space for an oil film which prevents accurate centering. When a long belt from an ordinary counter-shaft pulley is belted directly to the spindle pulley and driven at high speed, the pull is not uniform and vibration results from lack of alignment between the two shafts. An object of the invention, therefore, is to provide a mounting and a driving mechanism for grinding spindles which will efliciently meet the above and other requirements.

Ball bearings have heretofore been tried for grinding spindles but they must be carefully selected and precisely and accurately adjusted and any disturbance of the adjustment causes rapid wear. Another objectof the invention is to provide a ball bearing spindle which can be removed from its bearings without disturbing the adjustment of the latter. Another object is to provide an improved fastening for the belt pulley and grinding wheel.

\ To these ends and also to improve generally upon devices of the character indicated my invention consists in the various matters hereballs and. bein A pin looks the knurled latter being s aced from the housing and journalled in all bearingstherein. Fixed against a shoulder formed by an enlargement near one end of the housing are outer bearing rings 16 of a ball bearing, the rings having their thrust'faces on the outside of the held fixedly in position by a nut 18 threa ed in the housing. Near the other end of the housing are outer bearing rings 20 which have their thrust faces between the balls and are arranged to slide axially 1n an annular recess or enlargement of the bore of the housing. The recess is closed by a dust cap 22 threaded in the housing. Near one end of the housing the spindle has an enlarged portion forming a shoulder 24, the enlarged-portion being provided with right and left hand threads 26 fitting a smoothbore in the nut 18 and acting to exclude dust and grit and to retain lubricant in the bearing.

Inner bearing rings 28 are fitted to the spindle and one of them abutsagainst the shoulder 24. A spacing sleeve 30, re-K cessed on the inside, "spaces the inner bearing rings 28 from another set of inner bearing rings 32. The spindle 14 is prolonged beyond the housing at one end and carries a suitable tool, herein shown as a grinding wheel 34 fastened to the spindle by a screw 36. At the other end of the spindle is a small pulley 38 having an extension threaded on the spindle v and abutting against the inner bearing rings 32 to clamp them against the sleeve 30' and the sleeve and inner bearing rings 28 against the shoulder 24. Right and left threads 40 fitting a smooth bore in cap 22 exclude grit. By unscrewing the pulley 38, the spindle 14 with its tool can be removed without in any way disturbing the adjustment of the bearings, the

nut 18 and the balls in the left hand bearingfl'r holding the inner rings and the sleeve in place. Adjustably fixed in the 11 per portion of g the holder 10 is a shaft 42, t e shaft having a collar 44 hearing against one side of the holder and having at its other end a reduced portion 46 receiving a knurled collar 48 fastened in place by a nutthreaded on the shaft. dollar against turning on the shaft. As shown in Figure 4,

J 19 by a belt 60 to the smaller pulley 38. An exreference numerals that are used in Figures the hhlder is split as at 52 to clamp the shaft against the work and tlfe pull of the belt will 42,"there being a stud 54 fixed to one portion tend to tighten both threaded members. The

of the holder and extending upwardly threads 88 and 102 are of smaller pitch than through the other portion where it is threaded thethreads 96 so that a differential efiect 1s 5 to receive a clamping nut.. The shaft 42 has obtained which tends to tighten the clamping an'eccentric portion 56 arranged parallel to plates against the grinding wheel. In Figure the grinding spindle and surrounding this ec- 3 the same clamping means is shown applied centric portion and mounted on ball bearings to the spindle mounting of Figure 1 and cor is a comparatively large pulley 58 connected responding parts are indicated by the same tension 62 of smaller diameter than the pulley 1 and 2. Y art 58, receives the belt from any suitable Although the invention has been described It drive. It will be noted that the belt by reference to a specific construction, it 60 can be tightened even while the grinder 1 should be understood that, in its broaderas- 1 is running by loosening the clampingnut on pects, the mventionis not necessarily llmlted 80 the stud 54 and turning the shaft 42 by means to the precise construction selected for illusof the knurled collar 48 after which the ec.- tratlvepurposes. centric portion 56 of the shaft is fixed in its I claim: I new position. 1. In a spindle mounting for high speed Resting against a shoulder in the interior tools, a head having anopenmg for detach-' of the pulley is an outer bearing ring 64 of ably receiving a quill or housing, the housing the angular contact type, the balls cooperathaving'a bore with enlargements at the ends,

ing with an inner bearing ring 66 resting outer bearing rings in each enlargement, roll-' against a shoulder on the eccentric portion of ing elements for each set of rings, a nut 4 25 the shaft. A spacing sleeve 68 is placed bethreaded in one end of the housingfor clamp- 90 tween the inner race ring 66 and a second ining one setof rings against a shoulder formed ner race ring 70 which is held on the eccentric by the enlargement, the other set of bearportion of the shaft by a nut 72. Slidably ing rings being slidable in the other enlargemounted in the pulley is an outer race ring 74- ment and having thrust faces between the so having its thrust face outside of the balls rolling elements to insure simultaneous sli 9:5 and a washer 76 engaging the outer side of ingmovement, a spindle extending through the race ring serves as an abutment for springs tlie housin and havipf an enlargement form- 80 which are received in recesses in a cap 78 ing a shou der, thee argement having right threaded in the pulley. An oil well 82 leadand left threads fitting a smooth bore in the 86 ing through the cap 78 conducts oil through nut toretain lubricant and exclude foreign 100 the shaft to the interior of the pulley and matter, a tool on the end of the spindle, inner bearings. The springs 80 serve to automatibearing rings fitting the spindle at the shoulcally take up any wear in the pulley bearlng der, inner bearings fitting the spindle near and prevent play b pressin the outer race the other end of the latter, a spacing sleeve 1'0 ring at one end 0 the pulfiay towards the on the spindle between the inner sets of bear- 105, cooperating angular contact bearing at the ing rings, a driving member having an exother end of the pulley. Theball bearing tension threaded on one end of the spindle mountings which insure the rotation of the next to the adjacent innerbearing rin s to pulley and spindle on parallel axes reduce clamp the sets of inner bearing rings and the strain on the spindle and prevent chattering. sleeve as a unit against the spindle shoulder, 110, In Figure 2 there is shown a housing 84 a cap closing the end of thehousin and havwith a. spindle passing therethrough, the ing a smooth bore, the extension 0 the drivspindle having a mounting similar to the ing member having right and left threads 1 mounting of Figure 1, except that the spindle fitting in the bore of the cap,- the removal of has an enlarged portion 86 in place of a sleeve thedriving member alone enablin the spin- 7 1 m to space the inner bearingrings from one andle to be slid out of the housing wlthout disother. The spindle has a. reduced threaded turbing the bearings; substantially as dertion at 88 and an inner clamping late 90 scribed. is threaded thereon and has a smoot cylin- 2. In a spindle mounting for high speed dr cal portion 92 entering an opening in a tools,,a head having an opening for detachgrlndlng wheel 94. The spindle has a furably receiving a quillor housing, the housing ther reduced portion which is threaded as at having a bore with enlargements at the ends, 96 to rece1ve an outer clamping plate 98 for a set of outer bearing rings in each enlargesecurmg the grindin wheel. The pulley 100 ment, rolling elements for each set of rings, a 'at the other end of t e spindle has a reduced nut threaded in one endof the housing for 125 threaded portion as before, engaging threads clamping one set of rings against a shoulder :102 on the spindle. The threads 88 and'96 formed by the enlargement, the other set of on the clamping plates and the threads 102 rings being slidable in the other enlargement,- of the ulley extend in o positedirections so a spindle extending through the housing and that t e reaction of t e. grinding Wheel having an enlargement near one end forming 1 v 15 gnature.

a shoulder, a tool on the end of the spindle, a set of inner bearing rings fittiiig the spindle at the shoulder, means carried by the spindle for making a close joint with a bore 1n the 5 clamping nut, a second set in inner bearing rings fitting the spindle near an end of the latter, a driving pulley having an extension threaded on said end of the spindle for clamping the adjacent bearing rings, and a cap 10 closing the end of the housing and having a smooth bore, the extension of the ulley having right and left threads fitting In the bore of the cap; substantially as described. In testimony whereof I hereunto afiix my 1 PHILIP I=I. HUTCHINSON.

CERTIFICATE 0F CORRECTION.

N 1736 972 Granted November 26, 1929, m Patent 0. u

PHILIP H. HUTCHINSON; J

O O V I I O k It is hereby certified that error appears In the'printed specification of 3 claim above numbered patent requiring correction as tollows. sliigeelg 12112:: 2. for l for the word "bearings" read "bearing rlmfst pai eatnt 1510111,! be mad with I I "eers rd "of" read "In and that the sn 7 f the case il izsl corrections therein that the same may conform to the record 9 I the Patent Office. I I m Signed and sealed this 24th day of December, A. D. 1929.

' M- j- -M a Acting Commissioner of Patents. (Seal) I CERTIFICATE OF CORRECTION.

' Patent No. 1,736, 972. I Granted November 26 1929, to

PHILlP n, HUTCHINSON.

It is hereby-certified thatC ertificate' of Correction issued December' 24 1929, was erreneonsly drawn as to the correction in claim 2, and that this Cert ficate should have read as follows: Page 3. line 5, claim 2, for the word "in" read "of"; that the said Certificatemay conform to the record of the case in the Patent Ofiiee, I

Signed and sealed this 14th dayof January, A. D. i930.

I M. 1. Moore, (Seail Acting Commissionef of Patents- 

